Courtesy of a private collection. Click on the image for a larger view.

ADDENDUM

And speaking of threesomes…

let’s turn from art nostalgia to Lit nostalgia.

No, it’s not a mystery but it was written by the Grand Master himself—Lawrence Block—under the penname Jill Emerson. The paperback was published in 1970 and is long out of print, but it’s available in a Kindle edition here.